test(code-review): isolate pr review cache

apps/api/tests/test_local_code_review_cloud_fallback.py

@@ -41,6 +41,14 @@ def _fake_ollama_order(_workload_type: str) -> tuple[SimpleNamespace, ...]:
     )
 
 
+@pytest.fixture(autouse=True)
+def _disable_pr_review_cache(monkeypatch: pytest.MonkeyPatch) -> None:
+    def _no_redis():
+        raise RuntimeError("redis disabled for local code review unit tests")
+
+    monkeypatch.setattr("src.core.redis_client.get_redis", _no_redis)
+
+
 @pytest.mark.asyncio
 async def test_large_pr_uses_local_ollama_when_gemini_fallback_disabled(
     monkeypatch: pytest.MonkeyPatch,